physics

Which of the following phenomena causes capillary of liquids in tubes of narrow bore?

A. viscosity B. surface tension C. osmosis D. brownian motion Correct Answer: Option B B. surface tension

6 years ago

Calculate the effective resistance between P and Q in the diagram below.

A. 0.75Ω B. 4.00Ω C. 5.00Ω D. 7.00Ω Correct Answer: Option B B. 4.00Ω Explanation R = ½ + ½…

6 years ago

The diagram below illustrates three forces acting on an object at point O. If the object is in equilibrium, determine the magnitude of the force P.

A. 10.5N B. 11.0N C. 17.3N D. 20.0N Correct Answer: Option D D. 20.0N Explanation 10 - P sin 30…

6 years ago

There is always an uncertainty involved in any attempt to measure the position and momentum of an electron simultaneously. This statement is known as the?

A. de Broglie's law B. Heisenberg uncertainty principle C. Franck-Hertz experimental law D. wave-particle paradox Correct Answer: Option B B.…

6 years ago

A dry plastic comb used in combing hair was found to attract pieces of paper and dust. The most probable explanation for this phenomenon is that the comb has been given?

A. magnetization by induction B. electric charges by induction C. electric charges by conduction D. electric charges by friction Correct…

6 years ago

Which of the following statements about sound wave is not correct? Sound waves can be

A. reflected B. refracted C. diffracted D. polarized Correct Answer: Option D D. polarized

6 years ago

Which of the following factors can affect the speed of sound in air?

i. The temperature of the surrounding ii. The direction of the wind iii. The pitch of the sound. A. i…

6 years ago

The correct sequence of energy transformation in the operation of an x-ray tube is?

i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the…

6 years ago

In a nuclear reactor, chain reactions result from the release of?

A. electrons B. photons C. neutrons D. protons Correct Answer: Option C C. neutrons

6 years ago